I liked this puzzle, pretty difficult and time consuming, however I'd have to disagree with the first comment, as the author gave a *hint* (more of an answer or guide), that this puzzle is definitely bilaterally symmetrical, therefore not an assumption; but instead a new rule along with the original logic. Great job Author!
Took me a while; however, the puzzle is 100% logical and can be solved without the symmetry hint. I recommend using the symmetry hint though. Thank you for the puzzle!